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One Hour a Week: Moving to Prevent Disability in Adults With Lower Extremity Joint Symptoms.

Dorothy D Dunlop1, Jing Song2, Jennifer M Hootman3

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Achieving 55-56 minutes of moderate-vigorous physical activity weekly helps adults with lower extremity joint issues stay disability-free for four years. This minimum threshold supports mobility and daily living independence.

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Area of Science:

  • Gerontology
  • Rehabilitation Medicine
  • Epidemiology

Background:

  • Physical activity guidelines often lack specific thresholds for maintaining function in at-risk populations.
  • Adults with lower extremity joint symptoms are at increased risk of developing mobility and daily living disabilities.

Purpose of the Study:

  • To identify evidence-based physical activity thresholds for maintaining disability-free status over four years in adults with lower extremity joint symptoms.
  • To determine optimal activity intensity and duration thresholds for preventing mobility and activities of daily living disabilities.

Main Methods:

  • Analysis of prospective cohort data from the Osteoarthritis Initiative (n=1,564) using accelerometer monitoring.
  • Classification tree analyses to identify optimal thresholds for sedentary, light, moderate-vigorous, and bouted physical activity.
  • Biennial assessments of mobility disability-free status (gait speed ≥1m/s) and activities of daily living disability-free status over four years.

Main Results:

  • A minimum threshold of 55-56 moderate-vigorous minutes per week best predicted disability-free status over four years.
  • Individuals meeting this threshold had significantly lower incidence of mobility (3% vs 24%) and activities of daily living (12% vs 23%) disabilities.
  • These thresholds remained consistent across various demographic and clinical subgroups.

Conclusions:

  • Approximately one hour of moderate-vigorous physical activity per week is an evidence-based threshold for maintaining disability-free status in adults with lower extremity joint symptoms.
  • This minimum activity level can serve as a valuable intermediate goal for promoting physical activity and preserving independence.